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Evaluation of impact of spur dike designs on enhancement of aquatic habitats in urban streams using 2D habitat numerical simulations

机译:用2D栖息地数值模拟评价刺激堤防设计对城市溪流水生栖息地的影响

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摘要

Although channelized urban streams provide aesthetic and economic value, they reduce biodiversity and alter the habitats of aquatic organisms. Spur dikes not only prevent the erosion of riverbanks, but also generally improve aquatic habitats. River 2D is widely used to analyze the aquatic habitats. However, the model often faces a challenge of lacking sediment and riverbed evolution module, which is difficult to predict the change of aquatic habitats. In this study, a depth-averaged habitat model, which couples a two-dimensional water-sediment shallow water model with an Instream Flow Incremental Methodology (IFIM), was provided to evaluate the impact of spur dikes on the improvement of aquatic habitats in the Jinjiang Stream in Chengdu, China. The potential value of aquatic habitats was quantitatively evaluated by a weighted useable area (WUA). Under different spur dike scenarios, the WUA is greater than under natural conditions, that is, the construction of spur dikes is beneficial for improving the habitat of aquatic organisms in urban rivers. In addition, further analysis from the simulation results shows that the three-spur dike scenario with a flow of 40?m3/s represents the best layout of spur dikes. Our study indicates that adjusting the spur dike layout is an effective instrument to enhance aquatic habitats, and can provide a certain reference for water ecological restoration and river management.
机译:虽然通道化城市溪流提供审美和经济价值,但它们会降低生物多样性,并改变水生生物的栖息地。散步不仅可以防止河岸的侵蚀,还可以改善水生栖息地。河流2D广泛用于分析水生栖息地。然而,该模型通常面临缺乏沉积物和河床演化模块的挑战,这很难预测水生栖息地的变化。在这项研究中,提供了一种深度平均的栖息地模型,其与仪器流量增量方法(IFIM)相结合的二维水沉积物浅水模型,以评估驯化堤防对水生栖息地改善的影响晋江溪流在中国成都。水生栖息地的潜在价值由加权可用区域(WuA)定量评估。在不同的刺激场景下,WuA大于自然条件,即散堤的建设有利于改善城市河流中水生生物的栖息地。此外,仿真结果的进一步分析表明,具有40次流动的三次跳水场景代表了散堤的最佳布局。我们的研究表明,调整燃烧堤防布局是增强水生栖息地的有效仪器,可以为水生态恢复和河流管理提供一定的参考。

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